archery chronograph app,99 cents

[el greco]

First of I am not a speed freak.Having said that I wouldn't mind if my bow was a few feet faster than my friends bows!Also somebody posted that I am shooting low gpp.I agree that 7.2 gpp is low but my Hatfield is quiet and can take the beating.
In the first pic is my frontyard.Is quieter than the backyard where my neighbours A/C compressor sounds like a truck and I am tempted to put an arrow through it every time I hear it coming to life.So first you need a QUIET place.
Second pic is the apps starting screen.Set the distance you are going to be shooting.Today I got the same results from 10 and 15 yards.Third pic is the results after the shot..As you can see the result is not near the truth as it says 234 feet
BUT..Here is when fine tuning comes in play.. more pics and explanation in a while.

[el greco]

Allright.Starting screen:set your distance.Use a measuring tape.Mine was 45 feet(15 yards) from the tip of my arrow when I pulled it at anchor to my  target.Then place your phone about 3-4 feet from where you are going to be shooting.I put mine on the ground.Then hit the 20 secs button,grab your bow while the dude is counting down,aim and release after the dude counts one.A side not here DON'T release too early.After he says one i count one-go and then release.
On the bottom of the third pic it says shot fired fine tuning(left side) and on the bottom right it says shot landed fine tuning.I don't know if you can see in the third pic two red vertical lines on the screen.Those are actually 2 red arrows.
This is where they got to go after fine tuning

NOW there is a small detail that can set you off many feet apart.look closer

the second arrow is exactly where it is supposed to be on shot landed.
the first one I moved it purposely more to the left than it is supposed to be just to show you.Basically the idea is that with fine tuning you have to allign the arrows with the high peaks of the soundwaves of shot fired and shot landed.
BUT notice how in the shot fired, which is the sound peak right from the first arrow,there are two ledges..can you see that the highest peak is a really thin line after the first ledge?YOU DON'T want it there.

[el greco]

Where the first arrow needs to go is just where that first ledge starts to appear after the flatline(which represents the quiet before you shoot).Hopefully somebody with an actual chrono will download the app and compare the results

[Jayb]

I got it - I can't wait to try it out

[johnnyk71]

Dave said he was gonna try it with his bow, since he and I chronoed ours at Tannehill. That ought to give is some comparable data.

[stujay]

It will be interesting to see results from someone who also has a chronograph.

[Jmatt1957]

looks like fun